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Finding the Fourth Proportional to 21,065.44, 31,570.72 and 8,570.88

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Solution

The fourth proportional to 21,065.44, 31,570.72 and 8,570.88 is: 12,845.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,065.44 : 31,570.72 = 8,570.88 : x
  2. Step 2: Convert to fraction form
    21,065.44/31,570.72 = 8,570.88/x
  3. Step 3: Cross multiply
    21,065.44x = 31,570.72 × 8,570.88
  4. Step 4: Simplify right side
    21,065.44x = 270,588,852.63
  5. Step 5: Solve for x
    x = 270,588,852.63/21,065.44
  6. Step 6: Final answer
    x = 12,845.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.